種苗幼魚の計数用光センサヘッドの防汚システム System for Preventing Pollution of Light Sensor Head from Water Drops for Counter of Seedlings Fry

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Author(s)

    • 矢田 貞美 YADA Sadami
    • 東京水産大学 Leboratory of Ocean Machinery Engineering, Department of Marine Science and Technology, Tokyo University of Fisheries
    • 陳 〓 CHEN Hu
    • 東京水産大学 Leboratory of Ocean Machinery Engineering, Department of Marine Science and Technology, Tokyo University of Fisheries

Abstract

種苗幼魚の計数システムにおいて,光センサを利用して計数する場合にセンサの投・受光面に飛散汚水等が付着し,計数精度が徐々に低下する。そこで,著者らはセンサ投・受光面と計測用管の問にアスビレータを設けた吸引式防汚システムを考案・供試し,アスビレータへの流入量,計測用管の内壁からセンサの投・受光面までの距離,ならびに飛散水滴の大小と本システムの防汚性能との関係について検討した。結果の概要は次のとおりである。1.連続的な飛散を防止するためのアスビレータ内の流量が134ml/sで98 kPaの負圧を発生できた。2.飛散防止孔の長さを30mm,同孔内の真空圧差を2kPaに設定すると,落下速度10m/s時におけるセンサ投・受光面への水滴の飛散を防止できるものと推定される。

In case the scattering water drops and the scales when fish jumps in the operation process for countingseedlings fry, the light sensor head's face installed in the outside wall of the measuring pipe becomes polluted.Therefore, since the light line was cut off by the pollution, the light sensor operation and counting problemsarise. So, the authors developed a sucking out system for preventing pollution of the sensor head,s face fromscattering water drops with occurring vacuum pressure by an aspirator installed between the light sensor head'sface and measuring pipe. Flow rate of aspirator, a distance between the inside wall of measuring pipe and sensorhead's face, and the relationship between the size of water drops and perfomance of the system preventingpollution of sensor head's face from scattering water drops were investigated. The results were as follows.1. When flow rate of water into the aspirator was 134 ml/s, the vacuum pressure was 98 kPa.2. In case the length of the hole for preventing pollution of the sensor head,s face from scattering water was30 mm, the difference of pressure between the hole for preventing pollution of the sensor head's face fromscattering water and atmosphere was 2 kPa, and the scattering initial velocity of water drop was 10 m/s, itcould be estimated that preventing pollution of the sensor head's face from scattering water.

Journal

  • Journal of Fisheries Engineering

    Journal of Fisheries Engineering 33(3), 169-174, 1997-03-01

    The Japanese Society of Fisheries Engineering

References:  4

Codes

  • NII Article ID (NAID)
    10008274264
  • NII NACSIS-CAT ID (NCID)
    AN10278554
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    09167617
  • NDL Article ID
    4195018
  • NDL Source Classification
    ZR26(科学技術--農林水産--水産)
  • NDL Call No.
    Z18-1327
  • Data Source
    CJP  NDL  J-STAGE  JASI 
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